The cross-section measurement for the 3H(e,e'K+)nnΛ reaction
The cross-section measurement for the 3H(e,e'K+)nnΛ reaction
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3H(e,eK+)nnΛ 反应的横截面测量
DOI：
10.1093/ptep/ptab158
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发表时间：
2021
影响因子：
3.5
通讯作者：
K.N.Suzuki et.al. (SNN 7 of 83)
中科院分区：
文献类型：
--
作者：
Kogai Kazuhiro;Tada Yuichiro;Kazuhiro Kogai;小粥一寛;小粥一寛;小粥一寛;Kazuhiro Kogai;Kazuhiro Kogai;Kazuhiro Kogai;Kazuhiro Kogai;K.N.Suzuki et.al. (SNN 7 of 83)
超子的小结合能导致了对AsNn-Λ等三重态三体系统不存在束缚超核的预言。然而，GSI的不变质谱学报告了可能被解释为边界Λ态的事件。在杰斐逊实验室的实验大厅A，通过(e，e‘K+)反应，通过缺失质谱学寻找了ThennΛ态。本实验对ThennΛ态的研究具有更高的灵敏度，其精度提高了约3倍。本文着重分析了~3H(γ~*，K~+)X反应截面的推导。对在验收中检测到的事件进行分析，以将系统不确定性降至最低，其中蒙特卡罗模拟可以很好地再现数据()。Λ态的产生截面上限为21，当理论预测(−BΛ，Γ)=(0.2 5，0.8) MeV和(0.5 5，4.7) MeV时，达到了可信水平。这一横截面结果为检验nnΛ的存在提供了有价值的信息。
The small binding energy of the hypertriton leads to predictions of the non-existence of bound hypernuclei for isotriplet three-body systems such asnnΛ. However, invariant mass spectroscopy at GSI has reported events that may be interpreted as the boundnnΛ state. ThennΛ state was sought by missing-mass spectroscopy via the (e, e′K+) reaction at Jefferson Lab’s experimental Hall A. The present experiment has higher sensitivity to thennΛ-state investigation in terms of better precision by a factor of about three. The analysis shown in this article focuses on the derivation of the reaction cross-section for the3H(γ*,K+)X reaction. Events that were detected in an acceptance, where a Monte Carlo simulation could reproduce the data well (), were analyzed to minimize the systematic uncertainty. No significant structures were observed with the acceptance cuts, and the upper limits of the production cross-section of thennΛ state were obtained to be 21 andat theconfidence level when theoretical predictions of (−BΛ, Γ) = (0.25, 0.8) MeV and (0.55, 4.7) MeV, respectively, were assumed. The cross-section result provides valuable information for examining the existence ofnnΛ.